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在对稻穗发育过程的观察中,发现稻穗并不是最高只能有二次枝梗,而是在一定条件下,可职分化较高次枝梗。作者认为,以控制稻穗大小为目的,对稻穗的发育期可以划分为三期:①第一次枝梗延续期;②第二次以上枝梗和颖花分化延续期;③颖花退化期。实验结果指出,在茎的生长锥分化前后追施氮肥可以增加一穗颖花数和减少颖花退化数。
In the observation of the development of rice panicle, we found that panicle is not only the highest secondary branch stems, but under certain conditions, the higher grade secondary branches can be differentiated. The author believes that for the purpose of controlling the size of rice panicle, the developmental stages of rice panicle can be divided into three phases: ① the first branch of the stem extension; ② more than the second branch and spike extension; ③ spike degeneration period. The experimental results indicated that topdressing nitrogen fertilizer before and after growth cones could increase spikelet number and decrease spikelet degeneration number.